You will find one part each in Origins, Der Eisendrache ... map to build the Dragon Shield in BO3 Zombies. You can find one workbench near the spiral staircase in Nacht der Untoten.

This BO3 Zombies Perk will Replace your standard grenade with a spiderweb that slows down enemies while increasing your melee damage. Head up the stairs in the Shangri-La area and turn right from ...